비디오 인코더 디코더
목차
We need a product with SDI and PAL as input and the Ethernet stream as output, with H.265 decoding.
1. Vcan1681 supports SDI and PAL.
https://ivcan.com/p/hdmi-to-ip-encoder-modulator-module-board-cvbs-hdmi/
2. We have two firmware to support H265 and H264 encoder and decoder.
Does your video encoder decoder support HD-SDI? 1080p or 1080i.
1. Max supports 1080P.
2. HDMI input supports 4k.
Can your encoder is compatible with any h264/h265 decoder i.e. Nvidia jetson decoder etc
We need to ask the engineer, please tell us the details of the video decoder if you have.
We also have video encoder and decoder board, if you both us ours, then it is no problem.
For 4k or 1080p video what will be ethernet data rate?
The video bitrate is configurable by the customer (사용자).
We will use your video encoder board with two input (HDMI 및 PAL) and with 12V alimentation. Is it ok?
HDMI 또는 AV 입력을 의미합니까? (support two video types), 아니면 두 개의 동시 입력을 지원하려면 HDMI와 AV가 필요합니까??
큐: We need to have HDMI and AV to support two simultaneous inputs.
에이: 좋아요. Our firmware engineer will some days to make a new firmware to meet this function you need. I will upgrade it and show you the test video. https://youtu.be/izdFa1nw7u8
iVcan: Please help to confirm that HDMI and cvbs can be supported at the same time, 하지만 오디오는 둘 중 하나만 선택할 수 있습니다. (시스템은 비디오 액세스 상황에 따라 HDMI 오디오/아날로그 오디오를 선택합니다.), is it ok for you?
고객: We don’t need audio, so do what is the best for you.
iVcan: Our software engineer has made a software for you. Please check the pictures in the attachments.
Now it supports an HDMI camera and CVBS camera.
고객:
I have tested your encoder multiple times with our system. It is working fine overall.
But we have one big issue to be able to validate its usage :
Whenever we turn on the system Camera and the encoder at the same time we are unable to read the “mainStream”, we can only read the “subStream”.
We have to “Reboot” the encoder via the web interface to make it work: after the reboot we can directly read the mainStream.
We tried with both VLC and GStreamer.
What could we try to have both streams readable on startup ?
iVcan:
In the opinion of our engineers, it is either a problem with camera recognition or a problem with customer use.
I suspect that the board card did not recognize the customer’s HDMI camera.
This is easy to verify (if you cannot access the sub-stream, it will be difficult to verify).
Log in to the web server of the encoder board and you can see the camera recognition status on the video page.
iVcan:
The video page will only display the recognition status of one camera. If HDMI and AV cameras are connected and recognized at the same time, the video page will display the recognition status of the HDMI camera (such as 1080p60):
As long as the HDMI camera can recognize it normally, Mainstream can be accessed normally.
If the HDMI camera is not recognized normally, please check the HDMI wiring and power on the board again (note that this is a power cycle, not a software restart on the web page)
게다가, the board uses a random Mac address, so the Mac address will change every time we restart it.
For devices with an ARP cache (such as a PC), after restarting, it will be temporary (a few seconds) unable to access the board from the network. , We cannot access it until the arp request is re-initiated after timeout (the performance is that the coding board cannot be pinged for several seconds after restarting)
따라서, I guess another possibility is that when the customer accesses the mainstream, it cannot be accessed due to the above reasons. Then when the customer accesses sub-stream, the arp cache refreshes and the customer can access it, but the customer does not revisit the main-stream.
“Whenever we turn on the system camera and the encoder at the same time, we cannot read the “Mainstream”, we can only read the “subStream”.“
iVcan:
Judging from your description here, it seems that your camera is started after our encoding board. Please start your camera first, and then power on and start our encoding board to try it. Maybe it is not powered on at the same time. The powered-on order also matters. 예를 들면, your camera startup needs 10 초, but our encoder board startup needs only 5 초.
Because I am not sure whether your camera is very slow to initialize after power-on.
Because our encoder board starts very quickly, it may be that the camera has not been initialized after it started our encoder board, which may lead to some unexpected problems. This can also explain why “We have to “Reboot” the encoder via the web interface to make it work: after the reboot we can directly read the mainStream.”, because when your web page restarts the encoder board, the camera has already been initialized.
따라서, the final suggestions are as follows (I tried my best to list everything that came to mind and let you test them separately);
Look at the video page of the web server and confirm whether the HDMI camera is recognized normally (you can send a screenshot to us). As long as the camera is recognized normally, Mainstream can be accessed;
It is recommended that you ping the coding board under cmd first, and then access mainStream and subStream under vlc to avoid mistakenly thinking that Mainstream cannot be accessed due to random mac issues.
Let you start your camera first (for a few seconds), then power on and start our encoding board to try (see the reasons described above)
Follow your original operation of “turn on the system camera and the encoder at the same time”. "mainStream"을 읽을 수 없는 문제가 있는 경우, 우리는 “subStream”만 읽을 수 있습니다.” 재현된다, 웹페이지를 통해 인코딩 보드를 다시 시작하지 마세요., 하지만 카메라와 인코딩 보드 사이의 HDMI 케이블을 핫스왑하세요.. 그냥 핫스왑 작업인 것 같아요 (카메라가 인코딩 보드에 연결되지 않는 원인이 되는 플러그인 감지 문제인 것으로 의심되기 때문입니다.. HDMI 신호 보내기).
고객:
항상 하위 스트림을 읽을 수 있습니다.. 재부팅 후에만 mainStream.
iVcan:
그러면 인코더 보드가 카메라를 감지할 수 있습니다..
테스트를 해주세요.
Let you start your camera first (for a few seconds), then power on and start our encoding board to try.
엔지니어는 카메라 시작에 필요한 사항에 대해 걱정합니다. 10 초, but our encoder board startup needs only 5 초.
시작 시간이 다를 가능성을 배제하려면 이 테스트를 수행하십시오..
iVcan:
테스트할 때, 설정을 다시 조정하는 것이 좋습니다 (빨간 단어) or see the below picture.
고객:
The encoder board and the camera are both powered on at the exact same time. It is likely that the camera startup takes a bit longer than the encoder board.
I confirm that the camera seems to be not recognized on startup “CVBS pal” is displayed at the top.
I can ping the board fine before trying to read both streams
When I start my camera first (for a few seconds), then power on (15 seconds later) and start the encoding board, I can read the stream just fine.
If I “turn on the system camera and the encoder at the same time”. And then hot plug the HDMI (15 seconds later), I can read the stream just fine.
What can I do to be able to read the mainStream without having to do on of these things ? Send an http request reboot with my software, a few seconds after startup ?
iVcan:
잘, that proves my guess right. For our other customers, the camera and our encoding board are all powered on at the same time. The cameras can recognize our encoding board normally and send out HDMI signals. Only a few customers have encountered such problems using their customized HDMI cameras. The following is Solved by customers themselves (modifying their camera settings/changing cameras).
고객:
Do you have the version of the software you develop for us? We will precise it in our PO.
iVcan: The firmware version is v6.5.5a for your device.
We have a faulty of the video encoder, what should I do?
1. From the photo you showed, we found that the capacitor and inductor in the lower left corner were damaged due to external force. Perhaps they were knocked off during packaging and transportation, and your company accidentally knocked them off during operation.
강조 표시된 장치는 누락된 장치입니다., 어느 것:
1、C176：캡,10NF,+/-10%,X7R,1000V,SMD1206
2、C21：캡,22University of Florida의,+/-20%,X5R,6.3V,SMD0603
3、R34：페이스북,120R@100M,+/-25%,3에이,SMD0603(자기비드)
같은 부품을 찾아보세요, 교체한 후 다른 누락된 부품이 있는지 주의 깊게 확인하십시오..
아직도 궁금한 점이 있으시면, 연락주세요.
고객:
이 결함이 있는 부품은 어느 회로를 작동하는 데 사용됩니까??
iVcan:
1.5V 전원 공급 장치, DDR에 전원 공급， 아래 그림을 확인하시기 바랍니다.
고객:
귀하의 조언에 따라 구성 요소를 교체했습니다., 인코더가 작동하지 않습니다.
게다가, 우리는 용접의 다른 품질 문제를 발견했습니다., 여러 번의 수동 재작업.
보증 기간 내에 표준 교환을 진행하려면 어떻게 해야 합니까??
iVcan:
걱정하지 마세요, 우리에게 다시 보내주세요, 그러면 우리는 당신을 위해 새로운 것을 바꿀 것입니다.
Does your HDMI + CVBS video encoder board support ONVIF?
The engineer said that the ONVIF protocol is not fully supported. It depends on your specific requirements.
The video player supports RTSP, VLC, Easyplay, and protocol support UDP player.
Can I use hdmi stream and CVBS stream together?
Our video encoding board supports two channels of video at the same time, one is HDMI video stream and CVBS video stream encoding.
문제: DVB-T 변조기의 시간 특성은 무엇입니까? (송신기) 가지다? DVB-T 표준 ETSI EN을 보면 아래와 같은 내용을 볼 수 있습니다. 300 744.
하지만 DVB-T TX 모듈의 시간은 몇시입니까??
비디오 스트리밍 중 빠르게 변하는 주파수를 생각하고 있기 때문에 필요합니다., 따라서 우리는 이 모드의 실제 시간을 이해해야 합니다.. 우리는 QPSK를 사용합니다, CR=1/2, GI=1/32, 대역폭 = 8 메가 헤르츠.
대답: DVB-T 변조기, 전송된 심볼 시간과 보호 시간이 모두 동일합니다., 와 400 744 사양
cvbs를 IP로 변환기, av 신호 변환기를 이더넷으로, SDI CVBS 인코더,
큐: How much will be the latency if I connect two cameras (HDMI + CVBS)?
I have two cameras, one is a hdmi camera, and the second is a CVBS camera. I will convert both video streams to IP ethernet by this board and the opposite receiver side will be a computer.
에이:
The delay of the video encoding board must take into account the encoding and decoding. It is impossible to test the accurate delay from the encoding board alone.
보통, the delay caused by the decoder board is greater.
With different software players, the latency varies greatly. 예를 들면, using our Splayer the delay is about 100ms, and using VLC the delay can be up to 300ms.
The delay of the CVBS camera is difficult to measure accurately. Delays below 100ms are difficult to measure with a stopwatch. 게다가, the delay of Vcan1681 itself is not easy to test. Without the decoder board, you can’t even see the image. It cannot be calculated by using a stopwatch, and there is no way to measure it with an oscilloscope.
After the customer buys the encoding board, he will definitely need a player to decode. Then it is better to ask the customer what kind of player he plans to use for decoding (ours, the customer’s own, or a third party), so that we can know better whether the coding board can meet customer requirements (function and performance) 아니면.
How to test the video encoder board latency?
- I pointed the camera at the stopwatch on my computer screen.
- Another computer plays the video sent from the current encoding board and also displays the stopwatch on the computer screen.
- You need to reduce two times, namely the delay from the camera to the monitor. (Including camera and screen delay)
- Please check the below pictures
큐: How much is the latency if I use your encoder and decoder board?
에이: It is better to use our encoder and decoder board. The encoder and decoder board prices is the same. The below latency test result is only for your reference, not including the camera delay.
- CVBS input to our encoder board—–our decoder board with HDMI output, the delay is 60~90ms
- HDMI input to our encoder board—–our decoder board with HDMI output, the delay is 90~130ms
- HDMI 720P input our encoder board——–our decoder board with HDMI output, the delay between 80~100ms
- HDMI 1080P input our encoder board——–our decoder board with HDMI output, the delay between 100~130ms
For lower latency, you also can use our video encoder and video decoder board. It will be much better than playing the video streaming on your computer via the VLC player.
